Final answer:
Colloquial English is informal speech specific to certain dialects or regions. It includes slang and should not be used in formal academic writing.
Explanation:
Colloquial English refers to informal speech used in casual conversations that is often specific to certain dialects or geographic regions of a country. It is a distinct type of diction that falls under informal language, which also includes jargon, idioms, slang, and clichés. Slang, a part of informal language, describes nonstandard English words and is typically used in personal correspondence but should be avoided in formal academic writing.
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